I want to hang a picture in our stairwell above the stairs, but the stairs curve directly beneath the stairwell where I want to hang the picture. What is the best way to reach the wall above the stairwell?
The accepted answer qualifies as "simplest" for sure. For those of us who view the hardware store as our "toy store," Get one of those combo/multiposition ladders. Extend one side a notch or two more than the other so that all the feet sit solidly on one stair or another. In fact, some models even allow you to extend one of the feet on each side so you can set the ladder "sideways" on a staircase.
This gives you an excuse to buy one of these ladders because they're very cool and handy to use in all sorts of situations.